Liquid cooled brake



Feb. 27, 1940.

J. ,H. WILSON LIQUID COOLED BRAKE 2 ShetS-Sheet 1 Filed Sept. 14, 1938 ailnumunmmnuuuum Feb. 27, 1940. J wl N 2,191,604

LIQUID COOLED BRAKE Patented Feb. 27, 1940 UNlTED STATES PATENT OFFICE 2,191,604 I LIQUID COOLED BRAKE 4 John Hart Wilson, Wichita Falls, Tex. Application September 14, 1938, Serial No. 229,940

8 Claims.

This invention relates to means for cooling heat-generating surfaces, and more particularly for cooling braking surfaces, by the use of a cooling liquid such as water, 'oil,'or the like. Al-

though liquids other than water may be used for cooling purposes, for the sake of convenience the liquid containing jackets hereinafter referred to will be called water jackets and Water will be designated as the cooling liquid.

It is the general object of the present invention to'provide a device of the character described, in which water jackets are provided at or near the heat-generating surfaces, and novel and advantageous means are provided for circulating water to and through the water jackets.

Another object is the provision of a device of the character described, including headers secured on a rotating shaft for rotation therewith, and conduits extending from said headers to and from the water jackets adjacent the heat-gencrating surfaces, whereby provision is made for circulating water to a plurality of water jackets.

A further object is the provision, in a device of the character described, of novel and advantageous means for introducing cooling water longltudinally through a rotating shaft, and withdrawing heated water therethrough, without substantial loss of heat from the outgoing heated water to the incoming cooling water.

Another object is the provision of a unit comprising an inlet conduit and an outlet conduit separated by heat insulating material, the said conduits being secured together to form a unitary assembly which may be bodily inserted in a suitable recess formed inthe shaft of the rotating mechanism which includes the heat-generating surface or surfaces.

A further object is the provision of a unitary assembly such as described, in which the inlet and outlet conduits are semi-cylindrical in form, so that they may be welded or otherwise rigidly secured to form a cylindrical assembly which may beinserted bodily in a cylindrical recess in the shaft.

A further object is the provision of novel and advantageous means for introducing cooling water into the inlet conduit and withdrawing heated water from the outlet conduit. I

Other and further objects, features and advantages of the present invention will be more apparent to one skilled in the art from the following description taken in connection with the accompanying drawings in which Figure 1 is a longitudinal section through a The header I8, through which the incoming coolhoisting drum having braking surfaces, to which the present invention is applied;

Figure 2 is an enlarged detail view corresponding to the left hand end of Figure 1;

Figure 3 is a transverse section on line 3-3 of 5 Figure 1;

Figure 4 is an enlarged detail view of the parts adjacent line 3-3 of Figure 1; and

Figure 5 is a fragmentary transverse section on line 5-5 of Figure 1. m

In order'to factilitate an understanding of the invention, reference is made to the embodiment thereof shown in the accompanying drawings and detailed descriptive language is employed. It will nevertheless be understood that no limitation 5 of the invention is thereby intended and that various changes and alterations are contemplated such as would ordinarily occur to one skilled in the art to which the invention relates. Thus. while the present invention is illustrated and described as applied to a hoisting drum of the type commonly employed in connection with oil well machinery, it will be understood that the same or similar means may be employed for circulating water or other cooling liquid to heat-generat- 25 ing surfaces of many divergent natures, the present invention being suitable for application to most forms of rotating machinery having heat generating surfaces such as braking surfaces.

Referring to Figure 1, the apparatus there ,il- 39 lustrated comprises generally a shaft IIl, supported forrotation in antifriction bearings II and carrying a drum I2 secured thereon. To the radial flanges [3, I3 of the drum I2 are secured annular flanges I4, I4, which comprise 35 braking surfaces adapted to be engaged by brake shoes I5, I5. The mechanism for applying the braking pressure forms no part of the present invention and is not illustrated. The shaft I0 is adapted to be driven through a sprocket wheel 40 I 6.

Inwardly of each annular flange I4, I4 there is provided a water-tight jacket IT, IT, welded or otherwise suitably secured to the flange, through which water or other cooling liquid may a be circulated by the means about to be described.

Secured on the shaft I0, for rotation therewith, are a pair of semi-circular headers I8 and I9, which are preferably secured together by bolts or other suitable means, as may be seen in Figure 3.

ing water-passes, is connected, by means of a conduit 20, with the water jacket I1, and by means of a conduit 2| with the water jacket H. The

water passes, is connected with the water jacket I! through a conduit 22, and with the water jacket l1 by a conduit 23. The conduits 22 and 23 preferably communicate with the water jackets I1, IT at points approximately diametrically opposed to the points at which the conduits 20 and 2| communicate with the water jackets.

The shaft I is provided with a longitudinal cylindrical recess ll) in which may be inserted a unitary assembly comprising a semi-cylindrical inlet conduit 24, and asemi-cylindrical outlet conduit 25, the said conduits being separated by a layer of heat-insulating material 26 (see Fig ures 2 and The conduits 24 and 25 are preferably welded together in assembled relation, thus forming, with the intervening layer of heat insulating material, a rigidunitary assembly which may be inserted bodily in the shaft. The inner end of the conduit 24 is provided with a port 21 which communicates, through a transverse passage 28 in the shaft II], with the header i8. Simi-- larly the conduit 25 is provided with a port 29 communicating with a transverse passage 30 which in turn communicates with the header IS.

The assembly comprising the conduits 24 and 25 is provided, at its outer end, with a sleeve 3|,

I secured thereon and adapted to .rotate therewith,

the near or right hand end of the sleeve being adapted to fit into a corresponding recess in the end of the shaft It), being retained in place by means of a collar 32 secured to the end of the shaft by bolts 33 or other suitable means. Surrounding the sleeve 3|,' and journalled thereon so as to permit relative rotational movement of the sleeve therein, there is a cylindrical member 34 which is provided with two annular chambers 35 and 3B separated by an inwardly projecting annular flange 31. Seated in the latter is a packing ring 38 which, in conjunction with the sleeve 3|, serves to separate, ina water-tight manner, the annular chambers 35 and 36. Similarly, the annular chamber 36 is sealed off from theantifriction bearing 39 by means of a packing ring 40, and the annular chamber 35 is sealed off from the anti-friction bearing 4| by a packing ring 42. The anti-friction bearing 4| is also protected from atmospheric dirt by means of a cover plate 43 which closes the end of the cylindrical member 34.

The member 34 is provided with a port 44, into which is threaded a conduit 45 leading from a source of cooling water and communicating with the annular chamber 35, and thence, through a port 46, with the inlet conduit 24.- Similarly. a conduit 41, threaded into the port 48, communicates with the annular chamber 35 and thence through a port 49 with the conduit 25, and is adapted to withdraw heated water therefrom and conduct it to a suitable disposal point.

From the foregoing, the manner in whichthe cooling water is circulated will be easily understood. Cooling water coming into the device through the conduit 45passes into the annular chamber 35 and thence, through the port 46, into the inlet conduit 24, through the transverse passage 28 and in'to'the header l8. From the header IS the cooling water passes through the conduits 20 and 2| to the water jackets l1 and II respectively, where it is circulated against the flanges |4, l4 and serves to withdraw heat generated therein by the application of braking pressure. The heated water is withdrawn from the water jackets l1, ll'through the conduits 22 and 23, respectively, passing into theheader I9, through the transverse passage 3'), outlet condrical recess, which is most easily formed in the.

shaft. Obviously, the inlet and outlet conduits should always be separated by heat insulating material so that there will be a minimum transfer of heat from the outgoing heated water to the'incoming cooling water.

Likewise the headers I8 and I9 might be other than semi-cylindrical in their outer configuration, but the semi-cylindrical form is preferable since it permits of a uniform angular distribution of the mass of theheaders and their contents.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In a device of the class described, a shaft, means supporting said shaft for rotation, a drum secured on said shaft, said drum having a braking surface, a liquid-tight jacket carried by said drum adjacent said braking surface, and means for circulating a cooling liquid through said jacket, said last named means comprising'inlet I and outlet conduits disposed longitudinally within said shaft, said conduits being separated by a layer of heat insulating material, means connecting said conduits and said jacket, means con- I 4. In a device of the class described, a shaft,

means supporting said shaft for rotation, a drum secured on said shaft, said drum having a braking surface, a liquid-tight jacket carried by said drum adjacent said braking surface, and means for circulating a cooling liquid through said jacket, said last named means comprising inlet and outlet conduits disposed longitudinally within said shaft and projecting outwardly from one end thereof, said conduits being separated by a layer-of heat insulating material, a sleeve surrounding said projecting ends of said' conduits and secured to said shaft for rotation therewith, a member mounted on said sleeve and in which said sleeve is journalled for rotation, rel

ative thereto, said member having two internal annular chambers, means connecting said inlet conduit with one of said annular chambers, meansconnecting said annular chamber with a source of cooling liquid, and means connecting said outlet conduit with said second annular chamber, said second annular chamber having a port extending outwardly therefrom.

5. In a device of the class described, a. shaft,

rality of bl'lkinlllm. l liquid-tight jacket carriedbwsaiddnnnadiacenteachofsaidbrakingsurfaceaandmeansforcirculatingacooling liquid through each of said Jackets, said last namedmeanscanprisingapairofheaderssecured on said shaft for rotation therewith, condintsconnectingeachofsaidbeaderswitheach ofsaidiacketaaninletconduitconnectingwith one of said headers, an outlet conduit connectingwithsaidotherheader,saidinlet'andoutlet conduits being disposed longitudinally within saidshaftandseparatedbyalayerofheatinsulating material, means connecting said inlet conduit with a source ofrcooling water, and means connecting with said outlet conduit for conducting liquid therefrom.

6. A deviceaccording to claim 5, said inlet and outlet conduits being formed with complementary adjacent surfaces, said conduits being rigidly securedtogether,withsaidlayersofheatinsulating material disposed therebetween, to form a unitary assembly.

7.Adeviceaccordingtoclaim5,saidinlet and outlet conduits being of semi-cylindrical form and being welded together, with said layer of heat insulating material disposed therebetween. to form a unitary assembly.

8. In a device of the class described, a shaft, means supporting said shaft for rotation, a drum secured on said shaft, said shaft having a pluraiiw of braking surfaces, a liquid-tight jacket carried by said drum adjacent each of said braking surfaces, and means for circulating a cooling liquid through each of said jackets, said last named means comprising a pair of headers secured on said shaft for rotation therewith, con; duits connecting each of saidheaders with each of said jackets, an inlet conduit connecting with one of said headers, an outlet conduit connecting with said other header, said inlet and out let conduits being disposed longitudinally within said shaft and projecting outwardly from one end thereof, said conduits being separated by a layer of heat insulating material, a sleeve sur rounding said projecting ends of said conduits and secured to said shaft for rotation therewith, a member mounted on said sleeve for rotation relative thereto, said member having two internal annular chambers, means connecting said inlet conduit with one of said annular chambers, means connecting said annular chamber with a source of cooling liquid and means connecting said outlet conduit with said second annular chamber, said second annular chamber having a port extending outwardly therefrom.

' JOHN HART WILSON. 

